Se cargan las modificaciones para pasarela stripe

app/Models/Nivel.php

@@ -17,6 +17,11 @@ class Nivel extends Model
         return $this->belongsToMany(Plantel::class)->withPivot('plantel_id');
     }
 
+    public function nivelPlane() : BelongsToMany
+    {
+        return $this->belongsToMany(Plane::class);
+    }
+
     public function existe($plantelId = null)
     {
         if (!$plantelId) {

app/Models/Plane.php

@@ -16,6 +16,11 @@ class Plane extends Model
         return $this->belongsToMany(Plantel::class)->withPivot('plantel_id');
     }
 
+    public function nivelPlane() : BelongsToMany
+    {
+        return $this->belongsToMany(Nivel::class);
+    }
+
     public function existe($plantelId = null)
     {
         if (!$plantelId) {
@@ -27,6 +32,17 @@ class Plane extends Model
             ->exists();
     }
 
+    public function nivel($nivelId = null)
+    {
+        if (!$nivelId) {
+            return false;
+        }
+
+        return $this->nivelPlane()
+            ->wherePivot('nivel_id', $nivelId)
+            ->exists();
+    }
+
      public function conceptos(): BelongsToMany
     {
         return $this->belongsToMany(Concepto::class)